// import fetch from 'dva/fetch';

// function parseJSON(response) {
//   return response.json();
// }

// function checkStatus(response) {
//   if (response.status >= 200 && response.status < 300) {
//     return response;
//   }

//   const error = new Error(response.statusText);
//   error.response = response;
//   throw error;
// }

// /**
//  * Requests a URL, returning a promise.
//  *
//  * @param  {string} url       The URL we want to request
//  * @param  {object} [options] The options we want to pass to "fetch"
//  * @return {object}           An object containing either "data" or "err"
//  */
// export default function request(url, options) {
//   return fetch(url, options)
//     .then(checkStatus)
//     .then(parseJSON)
//     .then(data => ({ data }))
//     .catch(err => ({ err }));
// }
import fetch from "dva/fetch"
import jsonp from "jsonp"
import QS from "qs"
import { notification } from "antd"
// import { routerRedux } from "dva/router"
// import store from "../index"

const codeMessage = {
  200: "服务器成功返回请求的数据。",
  201: "新建或修改数据成功。",
  202: "一个请求已经进入后台排队（异步任务）。",
  204: "删除数据成功。",
  400: "发出的请求有错误，服务器没有进行新建或修改数据的操作。",
  401: "用户没有权限（令牌、用户名、密码错误）。",
  403: "用户得到授权，但是访问是被禁止的。",
  404: "发出的请求针对的是不存在的记录，服务器没有进行操作。",
  406: "请求的格式不可得。",
  410: "请求的资源被永久删除，且不会再得到的。",
  422: "当创建一个对象时，发生一个验证错误。",
  500: "服务器发生错误，请检查服务器。",
  502: "网关错误。",
  503: "服务不可用，服务器暂时过载或维护。",
  504: "网关超时。",
}
function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response
  }
  const errortext = codeMessage[response.status] || response.statusText
  notification.error({
    message: `请求错误 ${response.status}: ${response.url}`,
    description: errortext,
  })
  const error = new Error(errortext)
  error.name = response.status
  error.response = response
  throw error
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, options) {
  // 处理JSONP
  if (options.isJsonp) JSONP(url, options.body)
  else {
    // 正常fetch
    const defaultOptions = {
      credentials: "include",
      mode: "cors",
    }
    const newOptions = { ...defaultOptions, ...options }
    if (
      newOptions.method === "POST" ||
      newOptions.method === "PUT" ||
      newOptions.method === "DELETE"
    ) {
      if (!(newOptions.body instanceof FormData)) {
        newOptions.headers = {
          Accept: "application/json",
          // "Content-Type": "application/json; charset=utf-8",
          "Content-Type": "application/x-www-form-urlencoded",
          ...newOptions.headers,
        }
        if (newOptions.headers["Content-Type"].indexOf("json") !== -1) {
          newOptions.body = JSON.stringify(newOptions.body)
        } else {
          newOptions.body = QS.stringify(newOptions.body)
        }
      } else {
        // newOptions.body is FormData
        newOptions.headers = {
          Accept: "application/json",
          ...newOptions.headers,
        }
      }
    }

    return fetch(url, newOptions)
      .then(checkStatus)
      .then(response => {
        if (newOptions.method === "DELETE" || response.status === 204) {
          return response.text()
        }
        return response.json()
      })
      .catch(e => {
      //   const { dispatch } = store
      //   const status = e.name
      //   if (status === 401) {
      //     dispatch({
      //       type: "login/logout",
      //     })
      //     return
      //   }
      //   if (status === 403) {
      //     dispatch(routerRedux.push("/exception/403"))
      //     return
      //   }
      //   if (status <= 504 && status >= 500) {
      //     dispatch(routerRedux.push("/exception/500"))
      //     return
      //   }
      //   if (status >= 404 && status < 422) {
      //     dispatch(routerRedux.push("/exception/404"))
      //   }
      })
  }
}

function JSONP(url = "", body = {}) {
  const data = body
  return new Promise((resolve, reject) => {
    const params = Object.keys(data)
      .map(v => `${v}=${data[v]}`)
      .join("&")
    jsonp(`${url}?${params}`, { name: "jsonp" }, (err, res) => {
      if (err) {
        reject(err.message)
      } else {
        resolve(res)
      }
    })
  })
}
